clarify Compose install prerequisites (#4130)
clarify Compose install prerequisites (#4130)

* clarify Compose install prerequisites

Signed-off-by: Victoria Bialas <99cd2b71a4b4f6883e7934ce9590288e2952433f@docker.com>

* organized install on Microsoft Server into steps

Signed-off-by: Victoria Bialas <99cd2b71a4b4f6883e7934ce9590288e2952433f@docker.com>

* better highlighting and organization for the desktop systems section

Signed-off-by: Victoria Bialas <99cd2b71a4b4f6883e7934ce9590288e2952433f@docker.com>

* copyedit for consistency

Signed-off-by: Victoria Bialas <99cd2b71a4b4f6883e7934ce9590288e2952433f@docker.com>

* changed Docker server --> Docker per review

Signed-off-by: Victoria Bialas <99cd2b71a4b4f6883e7934ce9590288e2952433f@docker.com>

* attempt to clarify Compose / Docker Engine dependencies per reviews

Signed-off-by: Victoria Bialas <99cd2b71a4b4f6883e7934ce9590288e2952433f@docker.com>

* copyedits per reviews

Signed-off-by: Victoria Bialas <99cd2b71a4b4f6883e7934ce9590288e2952433f@docker.com>

johnstep/docker.github.io,docker/docker.github.io,anweiss/docker.github.io,shubheksha/docker.github.io,shin-/docker.github.io,JimGalasyn/docker.github.io,shubheksha/docker.github.io,JimGalasyn/docker.github.io,shubheksha/docker.github.io,JimGalasyn/docker.github.io,docker/docker.github.io,johnstep/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,londoncalling/docker.github.io,shin-/docker.github.io,docker/docker.github.io,anweiss/docker.github.io,anweiss/docker.github.io,thaJeztah/docker.github.io,londoncalling/docker.github.io,JimGalasyn/docker.github.io,londoncalling/docker.github.io,JimGalasyn/docker.github.io,anweiss/docker.github.io,thaJeztah/docker.github.io,londoncalling/docker.github.io,shubheksha/docker.github.io,shubheksha/docker.github.io,johnstep/docker.github.io,shin-/docker.github.io,johnstep/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,anweiss/docker.github.io,shin-/docker.github.io,johnstep/docker.github.io,londoncalling/docker.github.io,shin-/docker.github.io